Motor-starting device



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Patented 00,14,1919. I

.c. LANDE'RSON.

MOTOR STARTING DEVICE.

APPLICATION. HLED was In 1916'.

1,31$,-345. Patented Oct. 14,1919.

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the lifting of the rod L, and to return .it

4 The up CARL J ANDERSON, OF CHICAGO, ILLINOIS.

MOTOR-STARTING DEVICE.

Specification of Letters Patent.

Patented Oct. 14,1919.

Application filed June 21, 1916. Serial No. 105,021.

To all whom it may concern:

Be it known that I, CARL J. ANDERSON, a

citizen of the United States of America, and

a resident of the city of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Motor-Starting Devices, of which the fol lowing is a specification.

My invention relates to motor starting devices and has for its object improvement in such devices.

In the accompanying draWings- Figure 1 is a sectional front elevation;

Fig. 2 is a section on line 2-2 of Fig. 1;

Fig. 3 is a section on line 3-3 of Fig. 2;

Fig. 4 is a partial view on line 44 of Fig. 2; and v Fig. 5 is a detail.

On the slate Z is mounted a frame Y, and in this frame are solenoids consisting of magnets A A, etc, and cores B B, etc. Pivotally connected to the lower ends of the cores are links 0 C, etc, and throu h these links runs a rod L. In link C t e hole therein practically fits the rod, but in the other links the holesare slots of varying lengths as shown in Fig. 1. The rodL is the hail of a lever M pivoted at points N on the frame Y. In idle position the lower ends of the links rest on the plate Xof frame Y.

Secured to the bottom of plate X is a vaccum dash pot P, the piston of which is connected to the rod L by a connecting rod Q. The action of the dash pot is to restrain quickly to its lower position whenwlifted and released. I

livoted on the upper art of'the frame Y over the magnetsA, etc, are levers D D etc., which levers support movable carbon contact blocks E E etc. Secured on the slate Zare brackets R upon which brackets are mounted stationary contact blocks F F, etc, corresponding to the movable contacts. Springs S normally hold levers D, D, etc.,'in the position shown in Fig. 2. I 1

or ends of the cores B B etc., are provl ed with pins which are adapted to engage springs V onthe under faces of levers D D etc., and lift said levers so as to bring the movable contacts into electri-' cal connection with the stations. when the solenoids are actuate to raise. their cores. The cores and pins T are so contacts arranged that, in the lower position of the cores, the upper ends of said pins are variable distances from the springs V, as shown in Fig. 1.

The magnets A, A etc, are connected in an electric circuit in such a way that they will all be simultaneously energized uponclosing an electrical contact. This circuit is not shown, but may be of any kind which will simultaneously actuate the magnets. The connections to the magnets may be in series or in, multiple as is most convenient.

Uponenergizing the magnets, the cores begin simultaneously to rise. But as these cores are all'connected to the rod L, which in turn is connected to the dash pot, the rise of the cores is gradual and not sudden. Because the pin T on core B is nearer to the lever D than are the pins on the other cores, the lever D will be first moved to bring contact E against contact F When this occurs the core B will be stopped, but this does not stop the upward movement of the other cores because the rod L may move in the long slot in link C Similarly the pin T on core B will next move lever D to close E to F but the remaining cores may continue tomove by reason of the rod L rising in the slot of link C In the same way the remaining cores close the remaining electrical connections in succession, the operation stopping when the last core closes the last connection. 1

The object. of motor starters is to close electrical connections one by one so as to cut out electrical resistance step by step. The electrical connections having such resistance are well known and need no description. From what'has been previously given it will be seen that this device accomplishes this result by closing the movable contacts to the stationary ones in succession. As far as the solenoids themselves are concerned, the closing action would be very quick and nearly simultaneous. The rod L and dash pot P, however, serve as a controlling dewoe to prevent quick action and thereby successive closures. Dash pots may be of any size and are normally provided with adjustable air vents.

.What I claim is:

1. The combination with a series of stationaryv contacts, a corresponding series of movablev contacts, and a solenoid and core solenoids to operate simultaneously at the same speed so that the movable contacts will be operated successively.

2. The combination with a series of stationary contacts, a corresponding series of movable contacts, and a corresponding series of solenoids so arranged that each solenoid must move its core a difierent distance to operate its movable contact, of an interconnection arranged to restrain said cores so that their simultaneous operation will be at the same speed, and means for permitting cores with longer movements to continue operation after cores of shorter movement have been stopped.

3. A series of solenoids, a slotted link connected to the core of each solenoid, the slots in the different links being of different lengths, a rod or similar connection extending through said slots, and a dash pot connected to said rod and serving to control the operations of the solenoids.

4. The combination with a series 071": contact devices, and a corresponding series of electrical devices for moving the contact devices to contact closin position, each electric device being arranged so that it must move a different distance to operate its contact device, of means by which said electrical devices are started simultaneously and move at the same speed to close said contact de vices in succession.

5. The combination with a series of solenoids," and a device for controlling their operations, of means by which the solenoids unitedly and simultaneously operate to move the controlling device, and means by which the solenoids are stopped one by one, the controlling device being moved by the remaining solenoids until the last one is stopped.

CARL J. ANDERSON. 

